// strings/TestRegularExpression.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Simple regular expression demonstration
// {java TestRegularExpression
// abcabcabcdefabc "abc+" "(abc)+" }

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class TestRegularExpression {
    public static void main(String[] args) {
        if (args.length < 2) {
            System.out.println(
                    "Usage:\njava TestRegularExpression " +
                            "characterSequence regularExpression+");
            System.exit(0);
        }
        System.out.println("Input: \"" + args[0] + "\"");
        for (String arg : args) {
            System.out.println(
                    "Regular expression: \"" + arg + "\"");
            Pattern p = Pattern.compile(arg);
            Matcher m = p.matcher(args[0]);
            while (m.find()) {
                System.out.println(
                        "Match \"" + m.group() + "\" at positions " +
                                m.start() + "-" + (m.end() - 1));
            }
        }
    }
}
/* Output:
Input: "abcabcabcdefabc"
Regular expression: "abcabcabcdefabc"
Match "abcabcabcdefabc" at positions 0-14
Regular expression: "abc+"
Match "abc" at positions 0-2
Match "abc" at positions 3-5
Match "abc" at positions 6-8
Match "abc" at positions 12-14
Regular expression: "(abc)+"
Match "abcabcabc" at positions 0-8
Match "abc" at positions 12-14
*/
